Nitroglycerin controls chest pain but does not cure it. Continue to use nitroglycerin even if you feel well. Do not stop taking nitroglycerin without talking to your doctor. Stopping the drug abruptly may cause chest pain. Nitroglycerin can lose its effectiveness when used for a long time. This effect is called tolerance. If your angina attacks happen more often, last longer, or are more severe, call your doctor. .

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